One day during use the motor fell completely off this Husky 323C. I've had it apart and back together a few times afterwards, and I can't figure out what exactly keeps the motor firmly attached to the shaft. I'm currently online looking for a parts / service manual (no,not an Operator's Manual) to see if a critical part was lost when it fell apart. Any help is great. Manual can be sent to rkcorwin@sbcglobal.net